Wood-shredding machine



Nov. 19, 1929. o. B. RANDALL WOOD SHREDDING MACHINE 3 Sheets-Sheet 1 Filed Oct. 18, 1928 INVENTOR. Olirerliflandall,

Nov. 19, 1929. o. B. RANDALL 1,736,622

WOOD I SHREDDING MACHINE Filed Oct. 18. 1928 I5 Sheets-Sheet 2 63 IN VEN TOR OZiVerBHandall,

ATTORNEY. 7

Nov. 19, 1929 0, RANDALL 1,736,622

WOOD SHREDDING MACHINE Filed Oct. 18. 1928 3 Sheets-Sheet 3 INVEN TOR.

Olirerfi. Randall,

ATTORNEY.

Patented Nov. 19, 1929 PATENT OFFICE OLIVER BENNETT RANDALL, OF WHEELER, OREGON WOOD-SHREDDING MACHINE Application filed October 18, 1928.

This invention relates to a wood shredding machine and has for its primary object to provide, in a manner as hereinafter set forth, a machine for the purpose aforesaid into which scraps or stock of wood may be fed and suceessively subjected to tearing and crushing operations to pulverize said wood, thereby rendering the same into a pulp for use in manufacturing processes.

A further object of the invention is to provide a machine as aforesaid which is adjustable in order that the fineness or coarseness of the pulp produced by the machine may be varied as desired.

A further object of the invention is to pro vide'a machine as aforesaid which is sturdy and durable, simple in construction, positive in operation, and inexpensive to manufacture and assemble.

With the foregoing and other objects'in view the invention consists in the novel construction, combination and arrangement of parts as hereinafter more particularly described and illustrated in the accompanying drawings, wherein for the purpose of illustration is shown an embodiment of the invention, but it is to be understood that changes,

variations and modifications may be resorted to which fall within the scope of the invention as claimed.

In the accompanying drawings in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a side elevation of a wood shredding machine constructed in accordance with this invention. 7

Figure 2 is a horizontal section taken on line 2-2 of Figure 1.

Figure 3 is a vertical section taken on line 3-3 of Figure 1.

Figure 4 is a detailed View of a pair of shredding and turning rollers.

Figure 5 is an elevation of a modified form of driving means for the hammers.

Referring to the drawings in detail, the numeral 1 designates a base, which in the illustrated embodiment consists of a pair of spaced I beams, upon which is mounted a casing 2. The casing 2 is formed) with a plu- Serial No. 313,289.

rality of sections designated respectively by the numerals 3, 4, 5, 6, 7 and 8.

The section 3 is located at the rearward end of the machine and the side walls thereof are disposed in parallel relation and are pro vided on their outer faces with supports 9 for bearings 9 for a shaft 10 which extends through the section 3 and projects at either end from the side of the machine. Mounted on the shaft 10 to rotate therewith is a corrugated roller 11, which is disposed within the section 3 and the ends of which are adjacent to the side walls thereof. F ixedly secured to the shaft 10 is a pulley 12 which is adapted for connection with any suitable source of power, not shown, for driving the shaft 10 and roll er 11. Seated on each of the base members 1, below the supports 9, is a bearing 13 for supporting a shaft 14, upon which is mounted a corrugated roller 15, similar to the roller 11. The shaft 14 may be connected in any suitable manner with the source of power which operates the shaft 10 if desired.

Connected to the section 3 at the forward end thereof is the section 4, the side walls of which diverge in a forward direction. pisposed within the section 4 and seated on the base members 1 is an anvil 16, the upper surface of which is in horizontal alignment with the top of the roller 15.

Connected to the section 4 at the forward end edge thereof is the section 5, the side walls of which are disposed in parallel relation and to the outer faces of which is secured a pair of bearing supports 17. Each bearing support 17 is formed with an elongated vertical slot 18, within which is supported a bearing 19 for a shaft 20. Each bearing 19 is secured to the lower end of a coiled sprng 21, the upper end of which is secured to an adjusting pin 22 which is threaded through the top wall of the support 17. Adjacent the upper end of the spring 21, a stop 23 is provided on the pin 22. Mounted on the shaft 20 to rotate therewith is a primary shredding roller 24, which is disposed within the section 5 with the ends of the roller adjacent the side walls of the section. The roller 24 is formed in its periphery with righthand and left-hand. threads 25 and 26 respec tively, which respectively extend from the respective ends of the roller to the transverse median thereof. Seated on the base members 1, in vertical alignment with the support 1'? is a pair of bearings 27 for a shaft 28. Mounted on the shaft 28 to rotate therewith is a rollr 29 which formed in its periphery with right-hand and left hand threads 30 and 31 respectively, which are identical with the threads 25 and 26 of the roller 24. Connected to the forward end of the section 5 is the section 6, the side walls of which diverge in a forward direction. Disposed within the section 6 and seated on the base members 1 is an anvil 32, the upper surface of which is in horizontal alignment with the top of the roller 29.

Connected to the forward end of the section 6 is the section 7, the side walls of which are disposed in parallel relation and have secured to their outer faces a pair of bearing supports 3e. Each support 33 is formed with an elongated, vertical slot 34, within which is mounted a bearing 35 for a shaft 36. Each bearing 35 is supported by an adjusting pin 37 which is threaded through the top wall of the support 33 and the lower end of which is threaded into the bearing 35. lvlounted on the shaft 36 to rotate therewith a secondary shredding and turning roller 38, which is formed in its periphery with right-hand and lefthand threads 39 and respectively. The roller 38 is of the same construction as the roller 24 heretofore described except that the roller 38 is of greater length than the roller 24 and if desired, the threads 39 and 40 may be made smaller than the threads 25 and 26; Seated on the base members 1, in vertical alignment with the supports 33 is a pair of bearings 41 for a shaft Mounted on the shaft 42 to rotate therewith is a roller 43 which is a counter-part of the roller 38 heretofore described.

Connected to the forward end of the sec- "ion 1 is "he section 3 within the forward end of which is formed a bin 44, which is provided at its lower forward corner with a discharge element 45. Seated on the base members 1, between the bin 44 and secondary "ollers 38 and 43 is a pair of standards 46 which provide bearings for a shaft 47.-

Mounted on the shaft 47 to rotate therewith is a beater 48, which is in the form of a cyl-" inder and which is of materially greater diameter than the diameter of the secondary rollers 38 and Secured to the peripheral face of the beater 48 is a series of spaced, angular plates 49, the projecting edges of which are notched to provide teeth 50. The plates 49 extend longitudinally of the beater 48 and the teeth 50 project from the periphery of the beater 48 substantially at right angles.

Secured to the shaft 47 is a pulley 51 which is adapt-ed for connection with any suitable msaeee source of power, not shown, for the operation. of the shaft 47 and beater 48.

Secured to the outer face of each side wall of the section 6 is a bearing 52, into which is jouri'ialed one end of a shaft 53, the other end of which is mounted in a bearing 54 suppofed by a standard 55 which is located ad acent the machine.

Mounted on the shaft 53 to rotate therewith is a gear 56 which isadapted for connection with any suitable source of power, not shown, for the operation of the shaft 53 and gear 56. Fixedly mounted on the shaft 53, between the gear ,56 and bearing 52, is a gear 57, which is in mesh with gears 58 and 59, respectively mounted on the shafts 20 and 36. Seated on the base members 1, in vertical alignment with the bearings 52, is a pair of bearings 60 into each of which is journaled one end of a shaft 61, the other end of which is journaled in a bearing 62 carried by the standard 55. Mount d on theshaft 61 to rotate therewith is a gear 63 which is in mesh with the gear 57. The gear 63 is also in mesh with a pair of gears 64 and 65, which are respectively mounted on the shafts 28 and 42. The gears 57 and 63 are of greater diameter than the gears 58, 59, 64 and 65 in order that the gears 57 and 63 may be in mesh with the gears 58 and 64 and 59 and 65 out of mesh. W hen power is applied to the gear 56 to rotate the same in a clockwise direction, such power is transmitted through the shaft 53 to the gear 57, then to the gears 58 and 59 which causes the rollers 24 and 38 to rotate in a counterclockwise direction. The power is also transmitted from the gear 57 to the 63 which causes the latter to rotate in a counter-clockwise direction and from the gear 63 to the gears 64 and 65, which causes the rollers 29 and 43 to rotate in a clockwise direction. 7 I

The roller 24 may be adjusted relative to the roller 29 by the actuation of the adjusting pin 22, by means of which the bearings 19 are moved in a vertical direction within their supports 17. Due to the springs 21 which secure the bearings 19 to the pins 22, the roller 24-is resiliently supported and may be forcedupwardly by-pressure on the bottom thereof. The roller 38 is rigidly supported due to the direct connection of the bearings 35 with the pins 37 but by manipulation of the pins 37, the bearings 35 may be moved vertically within their supports 33, whereby the roller 30 is adjusted relative to the roller 43.

Mounted on the topof the casing 2, above each of the anvils 16 and 32, is a steam cylinder 66 which is adapted for connection with anysuitable source of steam, not shown. Each steam cylinder 66 is provided with suitable means for imparting reciprocatory movement to a plunger rod 67 which depends from the cylinder and the lower end of Which is secured to a hammer 68 which is forcibly driven against the anvil therebelow by the reciprocatory motion of the plunger rod 67.

Mounted on the top of each bearing support 9 is a steam chest 69 which is adapted for suitable connection with a source of steam for maintaining a predetermined downward pressure on a plunger rod 70 depending from the chest 69 in order to force the bearing 9, which is disposed within an elongated, vertical slot 71 in the support 9, thereby exerting a constant pressure of predetermined force upon the roller 11 towards the roller 15. The side walls of the sections 3, 5 and 7 are formed with slots, not shown, which are respectively in registry with the slots 71, 18 and 34, in order to permit a vertical movement to the shafts 10, 20 and 36.

In Figure 5 I illustrate a modified form of driving means for the plunger rods 72 and 7 3 which are connected to the respective hammers operating against the anvils l6 and 32. This operating means consists of a shaft 73 which is provided with a pulley 74 for connection with any suitable source of power, not shown. Rotatably mounted on the shaft 73 is a pair of eccentrics 75 and 76, which are respectively connected with connecting rods 77 and 78 which respectively are pivotally connected as at 79 with the plungers 72 and 73. The connection 80 between the connecting rods 77 and eccentrics 7 5 is diametrically opposite to the connection 81 between the con necting rods 78 and eccentrics 76 in order to alternately operate the plungers 72 and 73.

In the operation of my machine, stock is inserted between the corrugated rollers 11 and 15 from which it is fed onto the anvil 16 where it is subjected to a pounding or a crushing action by the rearmost of the reciprocatory hammers 68. From the anvil 16 the material is worked forwardly between the primary shredding and turning rollers 24 and 29 which are positively driven by means of the gears 58 and 64 in opposite directions. Due to the right and left hand threads 25 and 26, the roller 24 tears the material into shreads laterally towards both ends from the center and due to the similarly threaded but oppositely rotated roller 29 the latter tears the material into shreds from both ends towards the center. The material is also turned by the action of the rollers 24 and 29 and is deposited therefrom on the anvil 32 where it is subjected on the opposite side thereof, to a pounding or crushing action from the foremost reciprocatory hammer 68. From the anvil 32 the material is worked forwardly between the secondary shredding rollers 38 and 43 which further exert a tearing action on the material in opposite directions in the same manner as the rollers 24 and 29. From the rollers 38 and 43 the material is fed through an opening 82 in a housing 83 extending around the beater 48 into the path of the teeth 50 projecting from the periphery of the beater 48 and passes from the beater through an opening 84 into the bin 44.

It is to be understood that the embodiment of my invention herewith shown and described is to be taken as the preferred example .of the same and that various changes in the details of construction may be rcsortet to without departing from the spirit of the invention or the scope of the appended claims.

What I claim is 1. In a wood shredding machine, spaced reciprocatory pounding devices, and spaced rotatable shredding devices, said pounding dcvices being alternatelydisposed with respect to said shredding devices whereby material fed to the machine will be alternately pounded and shredded.

2. In a wood shredding machine, spaced reciprocatory pounding devices, and spaced rotatable shredding devices, said pounding devices being alternately disposed with respect'to said shredding devices whereby material fed to the machine will be alternately pounded and shredded, said pounding devices being vertically disposed and said shredding devices having the axes thereof disposed at right angles to the plane of movement of the pounding devices.

,3. In a wood shredding machine, spaced reciprocatory pounding devices, and spaced sets of rotatable shredding and turning rollers, the rollers of each set being disposed in superposed relation and formed in their peripheries with right and left-hand threads respectively extending from the. ends of the rollers to the transverse medians thereof.

4. In a wood shredding machine, spaced reciprocatory pounding devices, spaced sets of rotatableshredding and turning rolls, the rolls of each set being disposed in superposed relation and formed in their peripheries with right and left-hand threads respectively extending from the ends of the rollers tdthe transverse medians thereof, and means for rotating said rollers in opposite directions whereby one roller of a set will be caused to act on the material to tear the same in a direction from the ends of the roller to the center thereof and whereby the other roller of said set will be caused to act on the material to tear the same in a direction from the center of the roller towards the ends thereof, and whereby the material is turned by each set of rolls, thereby presenting the opposite side of the material to each succeeding pounding device.

5. In a wood shredding machine, spaced sets of rotatable, superposed shredding rollers, an anvil positioned in advance of each set of rollers, and a reciprocatory hammer associated with each anvil for exerting a pounding action thereon.

6. In a wood shredding machine, spaced sets of rotatable, superposed shredding rollers, an

iii) J and anvil positioned in advance of each set of rollcrs, a reciprocatory hammer associated with each anvil for exerting a pounding action thereon, and means for adjusting the rollers of each set relative to each other.

7. In a wood shredding machine, spaced sets of rotatable, superposed shredding rollers, an anvil positioned in advance of each set of rollers, a reciprocatory hammer associated with each anvil for exerting a pounding action thereon, and means for adjusting the rollers of each set relative to each other, the uppermost roller of one set being resiliently supported.

8. A Wood shredding machine comprising, a stock feeding device, a battery of alternately disposed pounding and shredding devices for receiving the stock from said feeder device and acting thereon to pulverize the same, and a heater device for receiving the material from said battery and for acting on said material to further pulverize the same.

9. A Wood shredding machine comprising a pair of superposed, corrugated rollers for feeding stock to the machine, spaced sets of superposed shredding rollers provided in their peripheries with right and left hand threads respectively extending from the ends of the rollers to the transverse medians thereof, an anvil located in advance of each set of rollers, a reciprocatory hammer associated with each anvil for exerting a pounding action thereon, means for rotating the rollers of each set in opposite directions, and a rotatable element having a plurality of teeth projecting from its periphery for acting on the material after the latter passes the last set of said rollers.

10. A wood shredding machine comprising a pair of superposed corrugated rollers for feeding stock to the machine, spaced sets of superposed shredding rollers provided in their peripheries with right and left hand threads respectively extending from the ends of the rollers to the transverse medians thereof, an anvil located in advance of each set of rollers, a reciprocatory hammer associated with each anvil for exerting a pounding action thereon, means for rotating the rollers of each set in opposite directions, a rotatable element having a plurality of teeth projecting from its periphery for acting on the material after the latter passes the last set of said rollers, means for adjusting the top roller of each set relative to the bottom roller thereof, and

means for exerting a constant predetermined pressure on the uppermost of said feed rollers.

In testimony whereof, I afiix my signature hereto.

OLIVER BENNETT RANDALL. 

